Is my bitcoin miner still running?
	Maybe...
	It uses at $4.30/day in electricity
	Emits somewhere around $1.30 in heat
	So it costs around $3.00/day
	Did it make that?

Calendar has turned into calendar soup
	We've talked about coin recovery a fair bit already
	
Non-Fungible Tokens (NFTs):
	fungible:  Any one is as good as any other
		Like dollars, crude oil, etc.
	non-fungible:  It matters which one you have
		Like most stuff we have
	cryptocurrency is fungible
	An NFT is a proof of ownership of a file
		A hash value of the file, anyway
		Public key X transfers file with hash Y to public key Z
		If you have the private key for Z, you own Y
			And therefore all files which has to it
	Started in 2014, "Quantum"
	Value went up really fast, and down really fast
		Could have made you rich
	"Ownership" here is just in the blockchain
		Some NFTs have legal ways to assign copyright to the NFT owner
		That adds a bit of legality to it
		But there's nothing that stops people from making a "fake" copy
	Which blockchain?
		Usually ethereum
		2nd biggest currency, but it's actually a more complicated system
		Has an Ethereum Virtual Machine, etc.
		Easy enough in the general way blockchains work

Copying, music, etc:
	Physical goods:  "copy" is usually different from "original"
		Patent, and the profitability of invention
		This does lead to software patent wars
	Status symbols
		What will people not do to impress each other?
		Does that really make a "legit" NFT worth more?
	A copy is really worth a lot less at fancy art auctions
		Not for "decorative" art
	In a sense, copying doesn't always matter
		More glory for the proper owner

"Pump and Dump" schemes:
	Gamestop stock rally was more than just a pump and dump scheme
		Involved short sellers, etc
	But in general, pump
	Bill Gates:  NFTs based on Greater Fool Theory

Let's differentiate between this kind of thing and the pyramid scheme:
	Pyramid scheme:  Money flows to the top, bottom of pyramid loses
		Kids and stickers
		They sometimes involve real money too
	
A bit of a wrapup about value:
	Anything somebody will exchange for something else is valuable
		This includes services as well as physical items
	Why would anybody be willing to purchase something?
		Need:  food, shelter, transportation, etc
		Safety:  fire extinguishers, door locks, guns, etc
		Vanity:  fancy cars, fancy clothes, NFTs, cosmetics, etc
		Investment:  stocks, bitcoin, bulldozers, NFTs, etc
		Pleasure:  movies, unhealthy food, video games, headphones, etc
		Benevolence:  wells, goats, clothes, vaccines, etc
		Health:  glasses, fillings, vitamins, gym memberships, etc
		... and many other reasons
		Many things fall into more than one category
			fancy cars could be for pleasure, transportation, status
			benevolence can be for vanity or investment
		What one person deems valuable might not be valuable to another
			Wim Hof	

(very) Brief history of bitcoin:
	Created in 2008, by "Satoshi Nakamura"
	Nakamoto mined about 1 million BTC
	Turned bitcoin over to the Bitcoin Foundation
		Lead developer Gavin Andreson
		Bitcoin Foundation has a bit of a mixed history
	Grew in use and value, but not steadily
		Price history is really shaky
	
What else could we use blockchain for?
	Wikipedia article has some ideas
	In general, it can be used to authenticate the history of a block
		proof-of-work is really not appropriate for a lot of uses
	My opinion:  It's still searching for the right problem

What we have left:
	Elliptic Curve Cryptography
	Proof of Stake